We found 3 dictionaries that define the word the mother of all:

General (2 matching dictionaries)

1. the mother of all: Merriam-Webster
2. the mother of all: Collins English Dictionary

Miscellaneous (1 matching dictionary)

3. the mother of all: Idioms

Phrases: The Mother of All Demos, more... ▸ Words similar to the mother of all ▸ Usage examples for the mother of all ▸ Idioms related to the mother of all ▸ Wikipedia articles (New!) ▸ Words that often appear near the mother of all ▸ Rhymes of the mother of all ▸ Invented words related to the mother of all